Soap



Famed June 1c, 1925.

ROBERT E. DIVINE, OI CHICAGO, ILLINOIS.

SOAP.

No Drawing.

To all whom it may. concern:

Be it known that I, ROBERT a citizen of the United States, residing atChicago, in the county of Cook and State of 5 Illinois, have inventednew and useful Improvements in Soaps, of which the following is aspecification.

The present invention relates to improvements in the manufacture ofsoaps and more 0 particularly to the prevention of'decomposition orrancidification of soaps, and particularly those made from fats whichrapidly develop rancidity, such as cottonseed .oil, cottonseed oilfoots, commercial greases and the like.

In accordance with the present invention, the fat from which the soap isto be made, which may be, for example, cottonseed oil foots, cottonseedoil, or other oil or fat, is

directly saponified or may be hy drolyzed in any suitable manner, forexample, by means of sulphuric acid, sulfo-fatty acid compounds or thelike and the resulting fatty acid removed by steam distillation. The

fatty acid is then converted into a soap, for example, by the usualkettle process, being neutralized, preferably with soda, boiled andwashed in the usual'manner, this procedure resulting in a soap stock ofthe desired commercial type, as is well recognized in, the art.

After the soap in either case has been sufficiently washed, it is drawnoff, and while in molten state there is incorporated into it I a smallproportion, say. from onetwentieth to one per cent, of an organic E.DrvINE,

Application flledflovember 7, 1923. Serial No. 673,369.

amine having a residual hydrogen atom, such as aniline, alphanaphthylamine, paraphenylene-diamine, diphenylamine,hexamethylenetetramine or the like. The soap is then dried in the usualmanner, the resulting dried soap being marketed in flaked form or incakes, as desired.

By the incorporation of the stabilizing compound, I have found that thedecomposition and rancidification of soaps, and particularly those madefrom fats having a particular tendency towards becoming. ranlcid, issubstantially prevented. Thus a soap made from the fatty acids ofcottonseed oil foot-s, in which one twentieth to one-half per cent ofdiphenylamine has been incorporated, has been found to remainpermanently sweet, the same soap without the addition of the stabilizingcompound becoming very rancid in approximately two weeks. Thestabilizing compound likewise prevents discoloration of the soap,keeping it in its original color.

I claim:

1. A soap containing a soap and from one-twentieth to one per cent of anaromatic amine.

2. A soap containing a soap and onetwentieth to one-half per cent ofdiphenylamine. a

3. A soap containing a soap derived from the fatty acids of cottonseedoil foots and one-twentieth to one-half per cent of diphenylamine.

' ROBERT E. DIVINE.

